🚀 go-pugleaf

From Experience:

     The temperature dependence of Is is the key, and the bad thing it
does is called thermal runaway.  With a good transistor curve tester, this
is easy to see.

     In  very basic language, as the temperature goes up, so does the
collector current, even for a constant base voltage.  As the current goes
up, so does the power dissipation.  As the power goes up, so does the
temperature. As the temperature goes up .....

Been there, not good.